1366 - Incorrect integer value: '' for column `shop_db3`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', 'af2f2b8b21957e0596f74356842394da', '18.188.44.223', '1713504488', '1713504488', '/product_info.php?info=p245_Drunt-am-Bergsee.html&XTCsid=3cd37329143049d8f2fab7a46749bac8')

[XT SQL Error]